phy: meson: add GXBB PHY driver
This adds support for the USB PHY found on Amlogic GXBB SoCs.
Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/drivers/phy/meson-gxbb-usb2.c b/drivers/phy/meson-gxbb-usb2.c
new file mode 100644
index 0000000..88c2ec6
--- /dev/null
+++ b/drivers/phy/meson-gxbb-usb2.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Meson8, Meson8b and GXBB USB2 PHY driver
+ *
+ * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+ * Copyright (C) 2018 BayLibre, SAS
+ *
+ * Author: Beniamino Galvani <b.galvani@gmail.com>
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <power/regulator.h>
+#include <regmap.h>
+#include <reset.h>
+
+#define REG_CONFIG 0x00
+ #define REG_CONFIG_CLK_EN BIT(0)
+ #define REG_CONFIG_CLK_SEL_MASK GENMASK(3, 1)
+ #define REG_CONFIG_CLK_DIV_MASK GENMASK(10, 4)
+ #define REG_CONFIG_CLK_32k_ALTSEL BIT(15)
+ #define REG_CONFIG_TEST_TRIG BIT(31)
+
+#define REG_CTRL 0x04
+ #define REG_CTRL_SOFT_PRST BIT(0)
+ #define REG_CTRL_SOFT_HRESET BIT(1)
+ #define REG_CTRL_SS_SCALEDOWN_MODE_MASK GENMASK(3, 2)
+ #define REG_CTRL_CLK_DET_RST BIT(4)
+ #define REG_CTRL_INTR_SEL BIT(5)
+ #define REG_CTRL_CLK_DETECTED BIT(8)
+ #define REG_CTRL_SOF_SENT_RCVD_TGL BIT(9)
+ #define REG_CTRL_SOF_TOGGLE_OUT BIT(10)
+ #define REG_CTRL_POWER_ON_RESET BIT(15)
+ #define REG_CTRL_SLEEPM BIT(16)
+ #define REG_CTRL_TX_BITSTUFF_ENN_H BIT(17)
+ #define REG_CTRL_TX_BITSTUFF_ENN BIT(18)
+ #define REG_CTRL_COMMON_ON BIT(19)
+ #define REG_CTRL_REF_CLK_SEL_MASK GENMASK(21, 20)
+ #define REG_CTRL_REF_CLK_SEL_SHIFT 20
+ #define REG_CTRL_FSEL_MASK GENMASK(24, 22)
+ #define REG_CTRL_FSEL_SHIFT 22
+ #define REG_CTRL_PORT_RESET BIT(25)
+ #define REG_CTRL_THREAD_ID_MASK GENMASK(31, 26)
+
+/* bits [31:26], [24:21] and [15:3] seem to be read-only */
+#define REG_ADP_BC 0x0c
+ #define REG_ADP_BC_VBUS_VLD_EXT_SEL BIT(0)
+ #define REG_ADP_BC_VBUS_VLD_EXT BIT(1)
+ #define REG_ADP_BC_OTG_DISABLE BIT(2)
+ #define REG_ADP_BC_ID_PULLUP BIT(3)
+ #define REG_ADP_BC_DRV_VBUS BIT(4)
+ #define REG_ADP_BC_ADP_PRB_EN BIT(5)
+ #define REG_ADP_BC_ADP_DISCHARGE BIT(6)
+ #define REG_ADP_BC_ADP_CHARGE BIT(7)
+ #define REG_ADP_BC_SESS_END BIT(8)
+ #define REG_ADP_BC_DEVICE_SESS_VLD BIT(9)
+ #define REG_ADP_BC_B_VALID BIT(10)
+ #define REG_ADP_BC_A_VALID BIT(11)
+ #define REG_ADP_BC_ID_DIG BIT(12)
+ #define REG_ADP_BC_VBUS_VALID BIT(13)
+ #define REG_ADP_BC_ADP_PROBE BIT(14)
+ #define REG_ADP_BC_ADP_SENSE BIT(15)
+ #define REG_ADP_BC_ACA_ENABLE BIT(16)
+ #define REG_ADP_BC_DCD_ENABLE BIT(17)
+ #define REG_ADP_BC_VDAT_DET_EN_B BIT(18)
+ #define REG_ADP_BC_VDAT_SRC_EN_B BIT(19)
+ #define REG_ADP_BC_CHARGE_SEL BIT(20)
+ #define REG_ADP_BC_CHARGE_DETECT BIT(21)
+ #define REG_ADP_BC_ACA_PIN_RANGE_C BIT(22)
+ #define REG_ADP_BC_ACA_PIN_RANGE_B BIT(23)
+ #define REG_ADP_BC_ACA_PIN_RANGE_A BIT(24)
+ #define REG_ADP_BC_ACA_PIN_GND BIT(25)
+ #define REG_ADP_BC_ACA_PIN_FLOAT BIT(26)
+
+#define RESET_COMPLETE_TIME 500
+#define ACA_ENABLE_COMPLETE_TIME 50
+
+struct phy_meson_gxbb_usb2_priv {
+ struct regmap *regmap;
+ struct reset_ctl_bulk resets;
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ struct udevice *phy_supply;
+#endif
+};
+
+static int phy_meson_gxbb_usb2_power_on(struct phy *phy)
+{
+ struct udevice *dev = phy->dev;
+ struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+ uint val;
+
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ if (priv->phy_supply) {
+ int ret = regulator_set_enable(priv->phy_supply, true);
+
+ if (ret)
+ return ret;
+ }
+#endif
+
+ regmap_update_bits(priv->regmap, REG_CONFIG,
+ REG_CONFIG_CLK_32k_ALTSEL,
+ REG_CONFIG_CLK_32k_ALTSEL);
+ regmap_update_bits(priv->regmap, REG_CTRL,
+ REG_CTRL_REF_CLK_SEL_MASK,
+ 0x2 << REG_CTRL_REF_CLK_SEL_SHIFT);
+ regmap_update_bits(priv->regmap, REG_CTRL,
+ REG_CTRL_FSEL_MASK,
+ 0x5 << REG_CTRL_FSEL_SHIFT);
+
+ /* reset the PHY */
+ regmap_update_bits(priv->regmap, REG_CTRL,
+ REG_CTRL_POWER_ON_RESET,
+ REG_CTRL_POWER_ON_RESET);
+ udelay(RESET_COMPLETE_TIME);
+ regmap_update_bits(priv->regmap, REG_CTRL,
+ REG_CTRL_POWER_ON_RESET,
+ 0);
+ udelay(RESET_COMPLETE_TIME);
+
+ regmap_update_bits(priv->regmap, REG_CTRL,
+ REG_CTRL_SOF_TOGGLE_OUT,
+ REG_CTRL_SOF_TOGGLE_OUT);
+
+ /* Set host mode */
+ regmap_update_bits(priv->regmap, REG_ADP_BC,
+ REG_ADP_BC_ACA_ENABLE,
+ REG_ADP_BC_ACA_ENABLE);
+ udelay(ACA_ENABLE_COMPLETE_TIME);
+
+ regmap_read(priv->regmap, REG_ADP_BC, &val);
+ if (val & REG_ADP_BC_ACA_PIN_FLOAT) {
+ pr_err("Error powering on GXBB USB PHY\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int phy_meson_gxbb_usb2_power_off(struct phy *phy)
+{
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ struct udevice *dev = phy->dev;
+ struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+
+ if (priv->phy_supply) {
+ int ret = regulator_set_enable(priv->phy_supply, false);
+
+ if (ret)
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+
+static struct phy_ops meson_gxbb_usb2_phy_ops = {
+ .power_on = phy_meson_gxbb_usb2_power_on,
+ .power_off = phy_meson_gxbb_usb2_power_off,
+};
+
+static int meson_gxbb_usb2_phy_probe(struct udevice *dev)
+{
+ struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+ struct clk clk_usb_general, clk_usb;
+ int ret;
+
+ ret = regmap_init_mem(dev_ofnode(dev), &priv->regmap);
+ if (ret)
+ return ret;
+
+ ret = clk_get_by_name(dev, "usb_general", &clk_usb_general);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(&clk_usb_general);
+ if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+ pr_err("Failed to enable PHY general clock\n");
+ return ret;
+ }
+
+ ret = clk_get_by_name(dev, "usb", &clk_usb);
+ if (ret)
+ return ret;
+
+ ret = clk_enable(&clk_usb);
+ if (ret && ret != -ENOSYS && ret != -ENOTSUPP) {
+ pr_err("Failed to enable PHY clock\n");
+ return ret;
+ }
+
+#if CONFIG_IS_ENABLED(DM_REGULATOR)
+ ret = device_get_supply_regulator(dev, "phy-supply", &priv->phy_supply);
+ if (ret && ret != -ENOENT) {
+ pr_err("Failed to get PHY regulator\n");
+ return ret;
+ }
+#endif
+ ret = reset_get_bulk(dev, &priv->resets);
+ if (!ret) {
+ ret = reset_deassert_bulk(&priv->resets);
+ if (ret) {
+ pr_err("Failed to deassert reset\n");
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int meson_gxbb_usb2_phy_remove(struct udevice *dev)
+{
+ struct phy_meson_gxbb_usb2_priv *priv = dev_get_priv(dev);
+
+ return reset_release_bulk(&priv->resets);
+}
+
+static const struct udevice_id meson_gxbb_usb2_phy_ids[] = {
+ { .compatible = "amlogic,meson8-usb2-phy" },
+ { .compatible = "amlogic,meson8b-usb2-phy" },
+ { .compatible = "amlogic,meson-gxbb-usb2-phy" },
+ { }
+};
+
+U_BOOT_DRIVER(meson_gxbb_usb2_phy) = {
+ .name = "meson_gxbb_usb2_phy",
+ .id = UCLASS_PHY,
+ .of_match = meson_gxbb_usb2_phy_ids,
+ .probe = meson_gxbb_usb2_phy_probe,
+ .remove = meson_gxbb_usb2_phy_remove,
+ .ops = &meson_gxbb_usb2_phy_ops,
+ .priv_auto_alloc_size = sizeof(struct phy_meson_gxbb_usb2_priv),
+};